IOException - 如果无法加载文件 [英] IOException - Cannot load file
问题描述
我有一个应用程序,显示GIF图像。 这一切工作正常,如果图像保存在绘制的,我访问它像这样
是= context.getResources()openRawResource(R.drawable.mygif)。
电影= Movie.de codeStream(是);
不过,我需要从互联网上下载的图像,所以我将其保存到CacheDir,工作正常。我想下面的阅读。
尝试
{
是=新的BufferedInputStream(新的FileInputStream(新文件(context.getCacheDir(),mygif.gif)));
}
赶上(FileNotFoundException异常E)
{
// TODO自动生成的catch块
e.printStackTrace();
}
电影= Movie.de codeStream(是);
这
电影= Movie.de codeFILE(新文件(context.getCacheDir(),mygif.gif)getPath());
但无论怎样,它结束
java.io.IOException异常
在java.io.InputStream.reset(InputStream.java:218)
在android.graphics.Movie.de codeStream(本机方法)
在android.graphics.Movie.de codeTempStream(Movie.java:74)
在android.graphics.Movie.de codeFILE(Movie.java:59)
或
java.io.IOException异常:标记已失效。
在java.io.BufferedInputStream.reset(BufferedInputStream.java:350)
在android.graphics.Movie.de codeStream(本机方法)
我觉得这是一个非常简单的错误,但我不能克服它。清单有:
<使用-权限的Android:名称=android.permission.INTERNET对/>
<使用-权限的Android:名称=android.permission.WRITE_EXTERNAL_STORAGE/>
建议:
1.try移动下载位置像其他文件夹: SD卡
,或应用程序,除了缓存另一个文件夹
。
2,当初始化的的InputStream
,请尝试使用方法:初始化一个缓冲区大小
INT缓冲区大小= 16 * 1024;
InputStream的是=新的BufferedInputStream(XXX,缓冲区大小);
3.to检查文件存在于你的文件夹
更新:修改code这样的和不使用 Movie.de codeFILE
的InputStream是= NULL;
尝试 {
是=新的BufferedInputStream(新的FileInputStream(新文件(getCacheDir(),mygif.gif)),16 * 1024);
is.mark(16 * 1024);
}赶上(FileNotFoundException异常E){
// TODO自动生成的catch块
e.printStackTrace();
}
电影= Movie.de codeStream(是);
没有异常抛出,而电影
不为空。
此外,虽然你的code会抛出异常,电影
也是不为空。
I have an app that shows GIF images. It all works fine if image is saved in drawable, and I access it like this
is=context.getResources().openRawResource(R.drawable.mygif);
movie = Movie.decodeStream(is);
But I need to download image from internet, so I'm saving it to CacheDir, that works fine. I tried the following to read it.
try
{
is = new BufferedInputStream(new FileInputStream(new File(context.getCacheDir(), "mygif.gif")));
}
catch (FileNotFoundException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
movie = Movie.decodeStream(is);
And this
movie = Movie.decodeFile(new File(context.getCacheDir(), "mygif.gif").getPath());
But no matter what, it ends with
java.io.IOException
at java.io.InputStream.reset(InputStream.java:218)
at android.graphics.Movie.decodeStream(Native Method)
at android.graphics.Movie.decodeTempStream(Movie.java:74)
at android.graphics.Movie.decodeFile(Movie.java:59)
or
java.io.IOException: Mark has been invalidated.
at java.io.BufferedInputStream.reset(BufferedInputStream.java:350)
at android.graphics.Movie.decodeStream(Native Method)
I think it's a very simple error, but I can't get over it. Manifest has:
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
suggestion:
1.try move the download location to another folder like: sdcard
, or the app another folder except the cache
.
2.when init the inputstream
, try use: init with a buffer size
int buffersize = 16*1024;
InputStream is = new BufferedInputStream(xxx,buffersize);
3.to check the file existed in your folder
update: change the code like this and dont use Movie.decodeFile
InputStream is = null;
try {
is = new BufferedInputStream(new FileInputStream(new File(getCacheDir(), "mygif.gif")), 16 * 1024);
is.mark(16 * 1024);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
movie = Movie.decodeStream(is);
no exception throw, and the movie
is not null.
Also, although your code will throw the exception, the movie
is also not null.
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